WHERE IN (array of IDs)

Question

I have webservice which is passed an array of ints. I\'d like to do the select statement as follows but keep getting errors. Do I need to change the array to a string?

Answer 1

Here's a Linq solution I thought up. It'll automatically insert all items in the list as parameters @item0, @item1, @item2, @item3, etc.

[WebMethod]
public MiniEvent[] getAdminEvents(Int32[] buildingIDs, DateTime startDate)
{
    // Gets a list with numbers from 0 to the max index in buildingIDs,
    // then transforms it into a list of strings using those numbers.
    String idParamString = String.Join(", ", (Enumerable.Range(0, buildingIDs.Length).Select(i => "@item" + i)).ToArray());
    command.CommandText = @"SELECT id,
                        startDateTime, endDateTime From
                        tb_bookings WHERE buildingID IN
                        (" + idParamString + @") AND startDateTime <=
                        @fromDate";
    // Reproduce the same parameters in idParamString 
    for (Int32 i = 0; i < buildingIDs.Length; i++)
            command.Parameters.Add(new SqlParameter ("@item" + i, buildingIDs[i]));
    command.Parameters.Add(new SqlParameter("@fromDate", startDate);
    // the rest of your code...
}